Grinding machine for brake drum



April 1965 SHIGEKICHI MIYABAYASHI 3,176,434

GRINDING MACHINE FOR BRAKE DRUM 3 Sheets-Sheet 1 Filed Oct. 8, 1962INVENTOR. .5 1 l'gakl cvh; baydshi April 6, 1965 SHIGEKICHI MIYABAYASHI3,175,434

GRINDING MACHINE FOR BRAKE DRUM Filed Oct. 8, 1962 '5 Sheets-Sheet 2INVENTOR.

5 K h' M! b ash' hlge. I yd ay I /H always April 6, 1965 SHIGEKICHIMIYABAYASHI 3, 76,434

GRINDING MACHINE FOR BRAKE DRUM Filed 001;. 8, 1962 5 Sheets-Sheet 3INVENTOR. 5/1 igeK icl'l/ Mi yd b y shi W Mia Win11 United States-Patent O This invention relates to a specital grinding machine, soarranged as to automatically grind casting fins and the finishingallowance on the periphery of a brake drum, being characterized byfeeding brake drums at predetermined intervals by feeding arms, rotatingthe drum after it is held in a central position to grind the this of thedrum periphery, followed by removal of the drumfrom this position aftergrinding and mechanically transferring the drum by another lever to thenext processing step.

The invention will be understood better by the following descriptionwith reference to the accompanying drawings illustrating an embodimentof this invention in which:

FIG. 1 is a front view showing in section the main elements;

FIG. 2 is a side elevational view;

FIG. 3 is an enlarged fragmentary front view showing a section of thefeeding arm and sliding member; and p FIG. 4 is an enlarged fragmentaryfront View showing a section of drum fitting portion.

In FIG. 1, on the charging side, a roller conveyor 1v is slightlyslanted or inclined at one end so as to slide a brake drum D thereon.The conveyor thereafter is substantially horizontal. vided with feedingarms 2, 2 to push the brake drum D from behind and on both sidesthereof. Members 3 are slidably connected to horizontal spaced guideshafts 5, 5, mounted on frame 4. Sliding members 3, 3 are pivotallyconnected to feeding levers 7, 7 through pins 9 and complementaryelongated holes 8 disposed in the upper end of levers 7. The lower endsof levers 7 are mounted on a transverse shaft 6 in turn mounted on frame4. Feeding levers 7, 7 are disposed to swing around transverse shaft 6,by virtue of an oil pressure cylinder 10 fixed on frame 4 together withsaid levers. Feeding arms 2, 2 are pivotally swingable in a verticaldirection to sliding members 3 by pins 11 connected thereto as shown inFIG. 3. The sliding members 3 are provided with supporting pins 13 urgedupwardly by a compression coil spring 12. The supporting pins 13 alwayskeep feeding arms 2 at such height as to push the brake drum D on theroller conveyor 1 toward the center portion of machine.

On the right side of roller conveyor 1, at the height less than that ofconveyor 1, is the neck of a brake drum mounting device 14. Device 14 isrotatably and vertically inserted by a bearing into frame 4. On theupper portion of the drum mounting device, as shown in FIG. 4, are drumclamping claws 15 in the form of bell cranks. Claws 15 project upwardlyfrom three sides of device 14 and are spaced equal distances therearoundand equal distances from the periphery of the drum mounting device so asto determine the center of drum D. Each drum clamping claw, is swingablyfixed thereabout by a pin 16 in the middle thereof. Each end of clampingclaws 15, 15, 15 is held from upward movement by push pins 17 projectingdoWnwardly into the drum mounting device 14 and is held from downwardmovement by compression coil springs 18. However when pin 17 is pusheddownwardly with a force overcoming the force in spring 18 the upperSliding members 3, 3 are proend of clamping claw 15- is moved inwardly,as shown bythe double dotted chain line 15' in FIG. 4, to securethe drumD on the loading plate at the-center-of drum. The clamping claws 15 arenormally disposed outwardly of plate 25 by springs 18'," as shownin FIG.4. To the lower end ofthe brake drum mounting device 14 is secured aspiral gear 19 in engagement with a spiral pinion 20. The spiral pinion20 is connected to a-mul tiple' disc' clutch 21 provided on the sideframe and operative to rotate drum mounting device 14 atpredeterminedintervals of time. Multiple disc clutch 21 is actuated bythe movement of a clutch lever 22 connected toa rod 24, which rod inturn is actuated by an oil pressure cylinder 23, horizontally disposedon frame 4, as shown" in FIG. 2. A lifting rod 26'isrotatable'withdrum'loading plate 25. Plate 25 has a plurality ofholes therein disposed below the push pins 17 which can extend therein.The lower part of rod 26 is actuated by'an oil pres-- sure cylinder 27fixed on frame 4, so as to raise-loading plate 25 to the positionindicated at 25' in FIG. 1 'adjacent roller conveyor 1 if desired, andto lower it on to the drum mounting device 14 as shown in-FIG. 2.

On the upper part of drum mounting device- 14 is a drum holder 29,having a drum holding plate 28 which rotates on the same vertical axisas lift rod- 26; Holder 29 is moved vertically by means of the-oilpressure cylinder 30 disposed on frame 4. The push-rods 17 depend fromplate 28. On the right side of'drum mounting device 14, and adjacent theendof -'a sloped roller conveyor 31 is a sliding member 33, with a-clawfor removing brake drum D from loading plate 25$ Sliding-member 33 ismounted on guideshaft 34" and connected to a lever 36, swingable about atransverse shaft 35 mounted on frame 4. A sliding piece or member 38' isjournalled.

on sliding member 33 and extends into an elongated opening 37 at the.upper end of lever 36. Lever 36 is connected with feeding lever 7 by arod 39 operated by oil pressure cylinder 10 in association with feedinglevers 7.

In the operation of the present invention, a brake drum fed on rollerconveyor 1 is pushed by the spaced feeding arms 2 under the action ofoil pressure cylinder 10 of feeding levers 7 and transferred onto drumloading plate in the position indicated at 25'. As soon as brake drum Dis loaded on the drum loading plate 25 on drum mounting device 14, drumholder 29 on the upper part of mounting device is moved downwardly byoil pressure cylinder 30. At the same time lifting rod 26 is loweredinto the interior of its oil pressure cylinder to lower loading plate 25with drum D onto drum mounting device 14.

At this time push pins 17, 17, 17 project through the holes in plate 25and actuate clamping claws 15, 15, 15 inwardly and fix brake drum Dthereon.

At this time oil pressure cylinder 10 is actuated to swing feed levers 7to the left to return feeding arms 2, 2 to their original positionspassing under the next drum D without interfering with the descent ofbrake drum D, while lever 36 on the discharging side of conveyor 1swings to the left by means of rod 39 to move claws 32 above the drummounting device 14.

Clutch lever 22 of multiple disc clutch 21 is then operated by oilpressure cylinder 23 and transmits through pinion 20 the motion of motorM to gear 19 to rotate the spiral gear 19 to grind the periphery ofbrake drum D on drum mounting device 14 with a high speed grinding wheelG, as shown in FIG. 2.

The grinding wheel G is then moved away from brake drum D. Lever 22 ofmultiple disc clutch 21 is then operated in reverse by oil pressurecylinder 23. When drum mounting device 14 stops rotating, drum holder 29is raised by oil pressure cylinder 30 and at the same time clampingclaws 15 are expanded outward by compres- Patented' Apr. .6, 1965* r pThe present invention is intended sion coilsprings to releasethe clampedbrake drum sliding members, spring means biasing saidarms'in an D. Then,when loading plate 25"is raised to position 25,, p

:sliding'r'ner'nbers in a horizontal direction.

'claw 32 moves brake drum Donto roller conveyor 31 while lever 36 swingsto the'right under the action of oil pressure cylinder 10. At; this time'fe'ed levers '7 linked with lever 36 swing tothe right to feed the nextbrake drum D onto'loading plate 25 by meansof feeding arms 2 andtheecycle is repeated. 7

. Drum D, transferred to roller-conveyor ,31' is then automaticallytransferred to the next process step.

upward direction and feeding levers for reciprocating'said 3; 'ljhemachine of "claim 1, wherein said claw means comprise a claw slidingmember'with a claw thereon, a lever pivotally swingable 'in a verticaldirection and having itsupper endconnected to said claw sliding memThough at present due: to striking development of casting technique, vanumbers of parts'of machine and automobile are made of casting, tofinish them complete 1y, grinding operation such as removal of finandfla'w as well as rough grinding of. finishing allowance as the firststep plays an important roll prior to finishingthe goods. Since theremoval of casting fin has hitherto been performed manually with achisel,hand grindera'nd the like, the operator is likely to becometired. The operation itself is also dangerous.

grinding process both in time and labor.

I claim: 5 r j 1. A grinding machine for a brakev drum comprising aframe, a horizontal brake drum loading plate for holding a brake drumthereon'while lits circumferential to, provide simplified. 3

f her.

4. The" machine of claim 3, wherein said plate is rotated'by a clutchmember'operatively connected to a pimonjand gear member secured to'saidplate for rota- ,tion therewith.

periphery is being ground, a first conveyorladjacent one side of saidplatefor feeding'a brake drum onto said p1ate,.'feed arm means for,pushinga'brake drum from said conveyor onto said plate, clamping. meansfor 'engaging the outer periphery of, said drum to fix "it on said plateduring the grindin'gfoperation, means for rotating said plate and'drumabout a verticaliaxis'during the grinding operation, a second conveyoradjacent the, other side of said plate for receivingla ground drumtherefrom, and claw means extending into the center of, said drum forpulling said ground drum from said 7 plate onto said second conveyor.; 1v

2. The machine of claim 1, wherein said feed arm means comprise spacedarms pivotally connected on LESTER SWINGLE, Primary Examiner. 7

- 5. Agrinding machine for a brake drum comprising a frame, a horizontalbrake drum loading plate for hold ing, a} brake 'drum thereon while itscircumferential periphery is beingground, a first conveyor adjacent oneside 'of'said plate for'feeding a brake drum onto said plate, feed armmeans" for pushing a brake drum from said conveyor onto saidplate,clamping means for engaging 'theout'erperiphery of-a drum to fix it-onsaid plate during the grinding'operation, said clamping means includinga plurality of circumferentially spaced clamping claws consisting ofbell crank levers, actuating means disposed above said crank leversoperatively connected :to said levers to move vertically downwardly tocause said claws togrip the outer periphery of a drum disposed on saidplate, means for rotating said plate and drum about a verticalflaxis'during the grinding operation, a

second conveyor adjacent the other side of said plate for receiving aground drurn therefrom and claw means extending 'into'the center [ofsaiddrurn for pulling said grounddrum from said plate onto said secondconveyor y 7 ,7

vReferences Cited by'the Examiner r UNITED STATES-PATENTS 1,332,248 3/20'Doane' 5V1.' 2l5.4"XR 7

1. A GRINDING MACHINE FOR A BRAKE DRUM COMPRISING A FRAME, A HORIZONTALBRAKE DRUM LOADING PLATE FOR HOLDING A BRAKE DRUM THEREON WHILE ITSCIRCUMFERENTIAL PERIPHERY IS BEING GROUND, A FIRST CONVEYOR ADJACENT ONESIDE OF SAID PLATE FOR FEEDING A BRAKE DRUM ONTO SAID PLATE, FEED ARMMEANS FOR PUSHING A BRAKE DRUM FROM SAID CONVEYOR ONTO SAID PLATE,CLAMPING MEANS FOR ENGAGING THE OUTER PERIPHERY OF SAID DRUM TO FIX ITON SAID PLATE DURING THE GRINDING OPERATION, MEANS FOR ROTATING SAIDPLATE AND DRUM ABOUT A VERTICAL AXIS DURING THE GRINDING OPERATION, ASECOND CONVEYOR ADJACENT THE